Case of Larva-25004 Group (Related to Kimsuky) Exploiting Additional Certificate - Malware Signed with Nexaweb Certificate

2025-05-24 Ahnlab

https://asec.ahnlab.com/en/88132/

Thumbnail for Case of Larva-25004 Group (Related to Kimsuky) Exploiting Additional Certificate - Malware Signed with Nexaweb Certificate

ASEC reports that Larva-25004, a cluster related to Kimsuky activity, used malware signed with a Nexaweb Inc. certificate. Two SCR files, including a job-description-themed sample, were signed in May 2024 with certificate serial 0315e137a6e2d658f07af454c63a0af2. Execution displays an employment-related PDF lure, and ASEC assesses from the bait content that the likely audience may include people interested in defense-company jobs. The certificate observed on these two malware files was not found signing other files in ASEC's review, while a previously used Nexaweb certificate did not show malware in the checked set.

Indicators of Compromise

Type Value First Seen Last Seen
HASH aa8936431f7bc0fabb0b9efb6ea153f9 2024-06-19 2025-05-30
HASH 28ce4d33e7994c2be95816eea5773ed1 2025-05-22 2025-05-24
HASH 0315e137a6e2d658f07af454c63a0af2 2024-08-24 2025-05-24
HASH 73d2899aade924476e58addf26254c2e 2024-06-19 2025-05-24

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